Dont mix a serious story, whith random humor
Ok, here are a list of flaws I found
SOUND: Terrible sound FX, you used the wrong sounds for a serious movie! The music was the only thing that made sense
GRAPHICS: Zero on the Bike looked like his legs werwe cut off, dont make a custom Zero then get lazy on details. Almost every characters feet were hovering above the ground. Even whebn the was no movement, sprites would move. Zeros claws looked bad, tidy them up. It was hard to read most of the text.
OTHERS: 'Nowerdays'??? NO!!! its spelt Nowadays, and dont give me any 'It can be spelt both ways, check google' crap, cos google is not a dictionary. Capital letters mixed with lower case letters? And lastly, why did 'Metal' (Sonic Verion) Change into A Shadow version?
In all, don't quit, you got the skills, you just need more details. Watch your movie 4-5 times after its finished to check for flaws.
Good luck with part 4